AP®ChemistryCollege BoardExam QuestionsUnit 3: Intermolecular Forces & PropertiesIntermolecular Forces

Intermolecular Forces (College Board AP® Chemistry)

Exam Questions

10 mins10 questions
11 mark
A diagram to show a molecule of serine

What is the strongest type of intermolecular force exhibited in the amino acid molecule serine?

  • permanent dipole-dipole forces

  • London dispersion forces

  • hydrogen bonding

  • covalent bonding

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21 mark
Propanone and propanal moelcules

Which of the following statements about propanone and propanal are correct?

I. The strongest type of intermolecular force in both molecules is hydrogen bonding

II. The strongest type of intermolecular force in both molecules is permanent dipole permanent dipole forces

III. Both compounds are soluble in water

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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31 mark

The correct order of increasing boiling points for the following compounds is

  • 1-chlorobutane (CH3CH2CH2CH2Cl) < butane (C4H10) < butan-1-ol (CH3CH2CH2CHOH)

  • butan-1-ol (CH3CH2CH2CHOH) < 1-chlorobutane (CH3CH2CH2CH2Cl) < butane (C4H10)

  • butane (C4H10) < 1-chlorobutane (CH3CH2CH2CH2Cl) < butan-1-ol (CH3CH2CH2CHOH)

  • butan-1-ol (CH3CH2CH2CHOH) < butane (C4H10) < 1-chlorobutane (CH3CH2CH2CH2Cl)

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41 mark

Which of the following is a nonpolar molecule containing polar bonds?

  • C2H6

  • I2

  • CCl4

  • H-C≡C-H

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51 mark

Which of the following compounds does not form hydrogen bonds?

  • NH3

  • CH3CHFCH3

  • CH3CH(OH)CH3

  • CH2NH2

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61 mark

Which of the cations is most likely to have the weakest attraction to an adjacent water molecule in solution?

  • Na+

  • Sr2+

  • Cs+

  • Ca2+

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71 mark
pentane and 2,2-dimethylpropane

Which isomer of pentane shown above has the highest boiling point and why?

  • 2,2-dimethylpropane because it can exhibit dipole-dipole forces.

  • Pentane because it is less compact than 2,2-dimethylpropane.

  • 2,2-dimethylpropane because its molecules are more polarizable.

  • 2,2-dimethylpropane because it has a greater molar mass than pentane.

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81 mark

Which of the following is not a correct representation of hydrogen bonding?

  • Salicylic acid H bonding - option A
  • Ammonia and water H bonding - option B
  • Ethanoic acid H bonding - option C
  • Amide H bonding - option D

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91 mark
A diagram to show the interaction between a solvent and water molecule

The diagram above represents a particle in aqueous solution. Which of the following statements about the particle is correct?

  • The particle is an anion.

  • The particle does not have a charge.

  • The particle is a cation.

  • Water is a nonpolar molecule, so the charge of the particle cannot be determined.

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101 mark

Molecule

Boiling Point °C

CH3CH2CHF2

-42

CH3CH2CHCl2

35

CH3CH2CHBr2

73

Which of the following statements is correct?

  • The strongest type of intermolecular force in CH3CH2CHF2 is hydrogen bonding.

  • London dispersion forces account for the difference in boiling point.

  • The dipole-dipole interactions between CH3CH2CHBr2 are stronger than the dipole-dipole interactions between CH3CH2CHCl2.

  • The molecules only interact through London dispersion forces.

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